HP UX Serviceguard Storage Management Software manual Cluster Messaging GAB

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Cluster File System Administration

Cluster Messaging - GAB

Cluster Messaging - GAB

GAB provides membership and messaging services for clusters and for groups of applications running on a cluster. The GAB membership service provides orderly startup and shutdown of clusters.

GAB is automatically configured initially when Serviceguard is installed, and GAB is also automatically configured each time the CFS package is started.

For more information, see the gabconfig(1m) manual page.

Chapter 3

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Contents Second Edition Legal Notices Contents Troubleshooting Cluster Volume Manager AdministrationPrinting History Printing HistoryPage Technical Overview Cluster File System Design Overview of Cluster File System ArchitectureCluster File System Failover Group Lock ManagerVxFS Functionality on Cluster File Systems Supported FeaturesCFS Supported Features CFS Unsupported Features Unsupported FeaturesCFS Unsupported Features Benefits and Applications Advantages To Using CFSWhen To Use CFS Benefits and Applications Chapter Cluster File System Architecture Role of Component Products Veritas Cluster Volume Manager FunctionalityCluster Communication Membership PortsAsymmetric Mounts About CFSCluster File System and The Group Lock Manager Primary and Secondary Mount Options Parallel I/OCluster File System Backup Strategies Synchronizing Time on Cluster File Systems Error Handling PolicyDistributing Load on a Cluster File System TuneablesExample of a Four-Node Cluster About Veritas Cluster Volume Manager FunctionalityPrivate and Shared Disk Groups Activation Modes for Shared Disk Groups Activation Modes for Shared Disk GroupsAllowed and conflicting activation modes Connectivity Policy of Shared Disk GroupsLimitations of Shared Disk Groups About Veritas Cluster Volume Manager Functionality Chapter Cluster File System Administration Cluster File System Administration Cluster Messaging GAB Cluster Communication LLT Volume Manager Cluster Functionality Overview Cluster and Shared Mounts Cluster File System OverviewAsymmetric Mounts Cluster File System Commands Cluster File System AdministrationGrowing a Cluster File System Time Synchronization for Cluster File SystemsFstab file Distributing the Load on a ClusterCluster File System Administration Snapshots for Cluster File Systems Cluster Snapshot CharacteristicsPerformance Considerations Creating a Snapshot on a Cluster File System# cfsumount /mnt1snap Cluster Volume Manager Overview of Cluster Volume Management Example of a 4-Node Cluster Disk group activation mode restrictions Either of the write modes on other nodes will fail # cfsdgadm display Behavior of Master Node for Different Failure Policies Disk Group Failure PolicyRecovery in a CVM Environment Troubleshooting Inaccessible System Installation IssuesIncorrect Permissions for Root on Remote System Resource Temporarily UnavailableInstallation Issues Mount Failures Cluster File System ProblemsUnmount Failures High Availability Issues Command FailuresPerformance Issues Cluster File System Problems Appendix a